PC28F00BP30EFA Datasheet, PDF (27/86 Pages) Micron Technology – Numonyx® Axcell™ P30-65nm Flash Memory

P30-65nm
8.3.3
Caution:
Note:
8.3.4
8.4
BEFP Program/Verify Phase
After the BEFP Setup Phase has completed, the host programming system must check
SR[7,0] to determine the availability of the write buffer for data streaming. SR.7
cleared indicates the device is busy and the BEFP program/verify phase is activated.
SR.0 indicates the write buffer is available.
Two basic sequences repeat in this phase: loading of the write buffer, followed by buffer
data programming to the array. For BEFP, the count value for buffer loading is always
the maximum buffer size of 512 words. During the buffer-loading sequence, data is
stored to sequential buffer locations starting at address 0x00. Programming of the
buffer contents to the flash memory array starts as soon as the buffer is full. If the
number of words is less than 512, the remaining buffer locations must be filled with
0xFFFF.
The buffer must be completely filled for programming to occur. Supplying an
address outside of the current block's range during a buffer-fill sequence
causes the algorithm to exit immediately. Any data previously loaded into the
buffer during the fill cycle is not programmed into the array.
The starting address for data entry must be buffer size aligned, if not the BEFP
algorithm will be aborted and the program fails and (SR.4) flag will be set.
Data words from the write buffer are directed to sequential memory locations in the
flash memory array; programming continues from where the previous buffer sequence
ended. The host programming system must poll SR.0 to determine when the buffer
program sequence completes. SR.0 cleared indicates that all buffer data has been
transferred to the flash array; SR.0 set indicates that the buffer is not available yet for
the next fill cycle. The host system may check full status for errors at any time, but it is
only necessary on a block basis after BEFP exit. After the buffer fill cycle, no write
cycles should be issued to the device until SR.0 = 0 and the device is ready for the next
buffer fill.
Any spurious writes are ignored after a buffer fill operation and when internal program
is proceeding.
The host programming system continues the BEFP algorithm by providing the next
group of data words to be written to the buffer. Alternatively, it can terminate this
phase by changing the block address to one outside of the current block’s range.
The Program/Verify phase concludes when the programmer writes to a different block
address; data supplied must be 0xFFFF. Upon Program/Verify phase completion, the
device enters the BEFP Exit phase.
BEFP Exit Phase
When SR.7 is set, the device has returned to normal operating conditions. A full status
check should be performed at this time to ensure the entire block programmed
successfully. When exiting the BEFP algorithm with a block address change, the read
mode will not change. After BEFP exit, any valid command can be issued to the device.
Program Suspend
Issuing the Program Suspend command while programming suspends the
programming operation. This allows data to be accessed from the device other than the
one being programmed. The Program Suspend command can be issued to any device
address. A program operation can be suspended to perform reads only. Additionally, a
Datasheet
27
Sept 2012
Order Number:208042-06